The trailer opens with Tony Stark/ Iron Man gripping the hand of a fallen comrade as a voiceover consisting of Nick Fury, Iron Man, the Vision, Thor and Black Widow begins.

“There was an idea, to bring together a group of remarkable people to see if we could become something more,” their voices utter over scenes of mayhem and destruction. “So when they needed us, we could fight the battles that they never could.”

We see the hairs on Peter Parker’s arm stand on edge before getting our first look at Thanos.

More glimpses of cities laid to waste are shown before Black Panther emerges with a bearded Captain America saying, “Get this man a shield.”

From the looks of the two-minute spot, this is shaping up to be Marvel's darkest movie so far, with major character deaths an almost certainty.

Infinity War will be followed by Avengers 4 (still untitled), and an in interview with Postmedia Network last summer Marvel Studios boss Kevin Feige said that the fourth film will end the first phase of the MCU.

“This original 22-movie arc ends with the untitled Avengers in May of 2019 and then two months later it will be Peter [Parker] and Spider-Man that usher us into the aftermath and how things proceed from there.”

In separate interviews, Tom Holland and Chris Pratt both teased the scope and depth of Infinity War, which is directed by the Joe and Anthony Russo and written by Christopher Markus and Stephen McFeely.

“It’s going to be the biggest movie of all time,” Holland told us. “Believe me; no one is ready for this movie.”

“It’s exactly what the fans want,” Pratt added in a separate interview. “I’ve heard over and over from people, ‘When are the Guardians going to meet up with the Avengers?’ I was never sure how that would happen or if that would happen, but then they announced it and called us and told us it was happening. … I can tell you, the fans are not going to be disappointed. It’s going to be really freaking cool. It’s been a long time coming. This is a decade’s worth of deep storytelling that all leads up to this thing.”